Texas Instruments INA214CIRSWR

Overview

INA214CIRSWR from Texas Instruments is a voltage-output, bidirectional current-shunt monitor with zero-drift architecture, designed for high-accuracy low- or high-side current sensing in power rails up to 26 V. It features 100 V/V fixed gain, ±60 µV maximum input offset voltage (RTI), 0.5 µV/°C max offset drift, ±0.5% max gain error over temperature, and operates from 2.7 V to 26 V supply with only 100 µA quiescent current - enabling precision 10-mV full-scale shunt measurements in battery chargers and telecom power management.

For engineers reviewing the INA214CIRSWR datasheet, INA214CIRSWR pinout, INA214CIRSWR application, or INA214CIRSWR equivalent, this page delivers verified technical context, package-specific pin functions, real-world use cases in power delivery systems, and validated alternative options - all grounded in TI's SBOS437K production data sheet and RSW-package characterization.

Technical Context

The INA214CIRSWR implements a zero-drift chopper-stabilized amplifier topology to achieve ultra-low offset and drift, supporting accurate bidirectional current measurement across shunts at common-mode voltages from –0.1 V to 26 V - independent of its 2.7–26 V supply. Its differential input stage rejects common-mode noise with ≥105 dB CMRR over –40°C to +125°C.

It uses internal precision resistor networks (R_INT = 10 kΩ for IN+ and IN–) to set its fixed 100 V/V gain, and includes a buffered REF input for level-shifting output voltage relative to system ground or a reference potential - critical for interfacing with single-supply ADCs in isolated or floating-sense applications.

Key Specifications

Pinout & Package

The INA214CIRSWR is packaged in a 10-pin Thin UQFN (RSW) with 1.80 mm × 1.40 mm body size and 0.5-mm pitch. This thermally enhanced, space-constrained package supports high-density PCB layouts and offers 107.3°C/W junction-to-ambient thermal resistance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-sense amplifier applications.

Compared with INA214AIDR and INA226AIRSAT, the INA214CIRSWR uniquely combines analog voltage output, UQFN thermal efficiency, and guaranteed ±0.5% gain error - making it optimal for closed-loop analog power regulation where latency, simplicity, and thermal robustness are prioritized over digital configurability or lowest cost.

Availability

INA214CIRSWR is available at Aetrix Electronics and suitable for battery management systems, telecom power supplies, server VRM monitoring, and industrial motor drives requiring stable component supply, long-lifecycle support, and traceable sourcing for production programs.

Supply support for INA214CIRSWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.

The INA21x product line was engineered specifically for high-accuracy, wide common-mode current sensing in power-constrained and thermally demanding applications - targeting battery-powered, telecom, and industrial equipment where offset stability and supply flexibility are critical.

FAQ

What is the maximum common-mode voltage the INA214CIRSWR can measure?

The INA214CIRSWR supports a common-mode input voltage range of –0.1 V to 26 V across its IN+ and IN– pins, as specified for Version C devices in TI's SBOS437K datasheet. This allows direct high-side sensing on 24-V industrial rails and tolerance of negative transients during switching events - all while powered from as low as 2.7 V. The INA214CIRSWR maintains specified accuracy across this full range without external level-shifting circuitry.

Does the INA214CIRSWR require external resistors to set gain?

No, the INA214CIRSWR has a factory-trimmed fixed gain of 100 V/V achieved through internal laser-trimmed thin-film resistors (R_INT = 10 kΩ). Unlike programmable current-sense amplifiers, it needs no external gain-setting resistors - reducing component count, layout complexity, and potential errors from resistor tolerance or thermal drift. This fixed-gain architecture is confirmed in Table 6-1 and Figure 4-2 of the official datasheet.

Can the INA214CIRSWR be used for bidirectional current sensing?

Yes, the INA214CIRSWR is explicitly designed for bidirectional current sensing. Its output voltage swings above and below the REF pin voltage depending on current direction: when current flows from IN+ to IN–, V_OUT = V_REF + (I_SHUNT × R_SHUNT × 100); reverse current produces V_OUT < V_REF. This behavior is documented in the functional description and simplified schematic (Figure 1) of SBOS437K, enabling charge/discharge monitoring in battery systems.

What is the purpose of the REF pin on the INA214CIRSWR?

The REF pin on the INA214CIRSWR sets the output voltage baseline - V_OUT = V_REF + (V_IN+ – V_IN–) × 100. It allows level-shifting the output to match ADC reference voltages (e.g., 0 V to 3.3 V), enables bipolar output for bidirectional sensing (e.g., REF = 1.65 V), and supports ratiometric measurements when tied to the same reference as the ADC. TI specifies REF input range as 0 V to V+, and warns against unbuffered resistive dividers due to CMRR degradation.

Is the INA214CIRSWR pin-compatible with other INA21x variants?

No - the INA214CIRSWR uses the 10-pin RSW (Thin UQFN) package, while variants like INA214AIDR use the 6-pin SC70 (DCK) package. Pin counts, layouts, and thermal pads differ fundamentally. Although electrical functionality (gain, offset, supply range) aligns across the INA21x family, mechanical compatibility requires package-specific footprint validation. TI's orderable addendum confirms RSW and DCK are distinct, non-interchangeable packages.